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|
mod error_document;
use crate::model::Settings;
use anyhow::{Result, anyhow, ensure};
use futures_util::TryStreamExt;
use serde::{Deserialize, Serialize};
use std::time::{Duration, Instant};
use tokio::io::AsyncReadExt;
#[derive(Clone, Debug, Serialize, Deserialize)]
pub struct Observation {
pub configuration_id: String,
pub generation: u64,
pub kind: String,
pub success: bool,
pub elapsed_ms: u64,
pub bytes: u64,
pub bytes_per_second: Option<f64>,
pub stop_reason: String,
pub retry_after_seconds: Option<u64>,
}
/// The caller supplies an authenticated, service-owned HTTPS proxy endpoint. This client
/// never inherits environment proxies or creates a direct route to the target.
pub async fn measure(
settings: &Settings,
proxy: &str,
certificate: &str,
id: String,
generation: u64,
speed: bool,
) -> Result<Observation> {
settings.validate()?;
let started = Instant::now();
let duration = if speed {
settings.maximum_duration_seconds
} else {
5
};
let deadline = tokio::time::Instant::now() + Duration::from_secs(duration);
let cap = if speed {
settings.maximum_download_mib * 1_048_576
} else {
4096
};
let proxy =
reqwest::Proxy::all(proxy).map_err(|_| anyhow!("Invalid protected probe endpoint"))?;
let certificate = reqwest::Certificate::from_pem(certificate.as_bytes())
.map_err(|_| anyhow!("Invalid private probe certificate"))?;
let client = reqwest::Client::builder()
.no_proxy()
.proxy(proxy)
.redirect(reqwest::redirect::Policy::none())
.tls_certs_merge([certificate])
.retry(reqwest::retry::never())
.user_agent(concat!("Roentgen/", env!("CARGO_PKG_VERSION")))
.build()
.map_err(|_| anyhow!("Could not initialize diagnostic TLS client"))?;
let url = if speed {
&settings.speed_url
} else {
&settings.ping_url
};
let response = tokio::time::timeout_at(deadline, client.get(url).send())
.await
.map_err(|_| anyhow!("Diagnostic request reached its deadline"))?
.map_err(|_| anyhow!("Proxied HTTPS request failed"))?;
if response.status().as_u16() == 429 || response.status().as_u16() == 503 {
let retry = response
.headers()
.get("Retry-After")
.and_then(|v| v.to_str().ok())
.and_then(|v| {
v.parse::<u64>().ok().or_else(|| {
httpdate::parse_http_date(v)
.ok()
.and_then(|date| date.duration_since(std::time::SystemTime::now()).ok())
.map(|d| d.as_secs().saturating_add(1))
})
})
.unwrap_or(30)
.max(30);
return Ok(Observation {
configuration_id: id,
generation,
kind: if speed { "speed" } else { "ping" }.into(),
success: false,
elapsed_ms: started.elapsed().as_millis() as u64,
bytes: 0,
bytes_per_second: None,
stop_reason: "provider-rate-limit".into(),
retry_after_seconds: Some(retry),
});
}
ensure!(
response.status().as_u16() == 200 || !speed && response.status().as_u16() == 204,
"Diagnostic endpoint returned an unexpected HTTP status"
);
let content_type = response
.headers()
.get("Content-Type")
.and_then(|v| v.to_str().ok())
.unwrap_or("")
.to_ascii_lowercase();
ensure!(
!content_type.contains("html"),
"Diagnostic endpoint returned HTML"
);
ensure!(
!content_type.contains("application/problem+"),
"Diagnostic endpoint returned an error document"
);
let status = response.status().as_u16();
let stream = response.bytes_stream().map_err(std::io::Error::other);
let mut reader = tokio_util::io::StreamReader::new(stream);
let mut buffer = [0u8; 16384];
let mut prefix = Vec::new();
let mut error_document = error_document::ErrorDocument::default();
let mut bytes = 0;
let reason;
loop {
if speed && bytes == cap {
reason = "byte-limit";
break;
}
let remaining = if speed {
(cap - bytes).min(buffer.len() as u64) as usize
} else {
buffer.len().min((cap + 1 - bytes) as usize)
};
let chunk =
match tokio::time::timeout_at(deadline, reader.read(&mut buffer[..remaining])).await {
Err(_) if speed && bytes > 0 => {
reason = "duration-limit";
break;
}
Err(_) => return Err(anyhow!("Diagnostic response timed out")),
Ok(Err(_)) => {
return Err(anyhow!(
"Diagnostic response failed before clean completion"
));
}
Ok(Ok(value)) => value,
};
if chunk == 0 {
reason = "complete";
break;
}
if prefix.len() < 512 {
let mut inspect = &buffer[..chunk];
if prefix.is_empty() {
inspect = inspect.trim_ascii_start();
while inspect
.first()
.is_some_and(|byte| matches!(byte, 0xef | 0xbb | 0xbf))
{
inspect = inspect[1..].trim_ascii_start();
}
}
prefix.extend_from_slice(&inspect[..inspect.len().min(512 - prefix.len())]);
}
error_document.feed(&buffer[..chunk]);
ensure!(
!error_document.confirmed_error(),
"Diagnostic endpoint returned an error document"
);
bytes += chunk as u64;
if !speed {
ensure!(bytes <= cap, "Ping body exceeds 4 KiB");
}
}
let prefix = String::from_utf8_lossy(&prefix)
.trim_start()
.to_ascii_lowercase();
ensure!(
!prefix.starts_with("<!doctype html") && !prefix.starts_with("<html"),
"Diagnostic endpoint returned an HTML document"
);
ensure!(
!error_document.is_error(),
"Diagnostic endpoint returned an error document"
);
ensure!(!speed || bytes > 0, "Speed response contained no data");
if !speed && settings.ping_url == Settings::default().ping_url {
ensure!(
bytes == 0 && status == 200,
"Default Ping must complete with HTTP 200 and an empty body"
);
}
let elapsed = started.elapsed();
Ok(Observation {
configuration_id: id,
generation,
kind: if speed { "speed" } else { "ping" }.into(),
success: true,
elapsed_ms: elapsed.as_millis() as u64,
bytes,
bytes_per_second: speed.then(|| bytes as f64 / elapsed.as_secs_f64().max(0.000_001)),
stop_reason: reason.into(),
retry_after_seconds: None,
})
}
|
